@techreport{ono-sipping-end2middle-security-04,
    number =    {draft-ono-sipping-end2middle-security-04},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ono-sipping-end2middle-security/04/},
    author =    {Prof. Kinji Ono and Shinya Tachimoto},
    title =     {{End-to-middle security in the Session Initiation Protocol(SIP)}},
    pagetotal = 16,
    year =      2005,
    month =     feb,
    day =       21,
    abstract =  {Some services provided by intermediaries depend on the ability to inspect the message bodies in the Session Initiation Protocol (SIP). When sensitive information is included in these bodies, a SIP User Agent (UA) needs to protect it from intermediaries except those that the UA agreed to disclose it to. This document proposes a mechanism for securing information passed between an end user and intermediaries using S/MIME. It also proposes mechanisms for an intermediary to notify the UA about its need to inspect an S/MIME-secured message body, and to notify the need for the message body to be transmitted securely.},
}